Unable to join online games of Among Us due to Parental Controls that were never set up?

I want to join online games of Among Us on my Xbox. When I try to join, I get a message saying that I cannot do this owing to Parental Controls.

I have never set up Parental Controls on my Xbox, and there are no 'Family' settings pertaining to me.

How can I enable myself to play Among Us with others online?

This answer assumes that you have indeed never set up any Parental Controls.

1. Quit Among Us.
2. Open 'Settings'
3. Open 'Privacy and Online Settings'
4. Default privacy and safety settings are in place for adults, teens, and children, but you can customize them. In this case, the setting was already set to 'Custom'. Change this to the default setting for 'Adults'.
5. Start Among Us and join an online game.

To add to the above, if you don't want a child account to have adult settings, you need to go to the adult account, and then go to settings, family settings and then select the child account. You can then go to the Privacy settings, Xbox settings, communication settings and then ensure that at least text communications are set to Everybody. This will let the child account join general games.